Packing of a sealing cap for the sealing and tightening of container closures, especially bung closures



March 19, 1940. MAUSER 2,194,147

PACKING OF A SEALING CAP FOR THE SEALING AND TIGHTENING 0F CONTAINERCLOSURES, ESPECIALLY BUNG ULOSURES Original Filed Doc. 1, 1934 2Sheets-Sheet 1 I 3nnentor.: /7. 77762136)" 1 attorney March 19, 1940. AMAUSER 2,194,147

0 CAP FOR was ssALmq PACKING OF A SEALIN AND TIGHTENING 0F GONTAINERCLOSURES, ESPECIALLY BUNG CLOSURES Original Filod D09;- 1, 1934 2Sheets-Shoot 2 Jnnentor:

Gttorneg Patented Mar. 19, 1940 UNITED STATES;

PATENT OFFICE CLOSURES Alfons Mauser, Marlenburg, Cologne, Germany,

' aseignor, by mesne assignments, to N.

Serlox, The Hague, Netherlands 1 Application Deoember 1, 1934, SerialNo. 755,592.

Renewed December 28, 1938.

cember 21, 1933 In Brazil n 2 Claims. (Cl. 220-39) This inventionrelates to a packing for sealing caps for the sealing and tightening ofcontainer closures, especially bung closures, wherein the cap surroundswith its edge an annular flange 5 provided at the opening of thecontainer and serving as an abutment.

It is known to use the cap for an'additional sealing by providing apacking between the edge of the opening and the upper part of the cap.In order to make such sealing effective, considerable pressure must beexerted on the top of the can while the edge of the cap is drawn in, by

means of a pressing tool, beneath the annular flange of the containeropening, the annular flange serving as an abutment. Containers havingbung closures are usually made of very thin material so that thepressure exerted on the cap leads to a deformation of the parts of thecontainer'. Locking tools have been proposed wherein only a pressureexerted radially on the cap ment, the cap sliding downwards when drawnin against the annular flange surface which is inclined downwards. Thisassumption has proved to be incorrect. When the radial pressure isexerted on the edge of the cap, the upper part thereof which isstiffened by the top of the cap affords the greatest resistance so thatwhen the flexible lower edge is drawn in, the cap slips upward insteadof downward. This undesired 3 counteracting could be prevented-byabutments provided on the cap edges for the clamping jaws which effectthe drawing in. However, it is necessary in connection with the sealingcaps that the drawn-in cap edge bears tightly, and.without leaving aprojection, against the neck of the annular flange of the opening of thecontainer so as to preventany inducement for an unauthorizedmanipulation of the sealing cap. Consequently, in connection with such asealing method of the sealing ca-p, the-exertion of considerable axialpressure on the cap cover when locking the same is unavoidable if thescaling is to be eflfective. In such cases, as for instance in bungclosures, wherein the packing by the abovedescribed cap sealing methodcannot take place directly upon the body of the container, theadditional sealing eflect does not take place. Fl-

nally, the tightening is greatly affected by the upper part of theannular flange being :damaged which easily occurs for ObViQllS reasons.

The aforesaid drawbacks are obviated by the present invention. Accordingto the invention, the sealing cap is provided in the interior of theedge to be drawn in with a compressible lining 'edge must cause the capto make an axial moveor covering of cork, rubber, asbestos or the like,or the outwardly extending part of the closure opening is providedtherewith. Band-like material prepared from waste atflow cost may beused for the aforesaid sealing, or a homogeneous or adhesive applying ofthe packing material may take place. The sealing cap provided with sucha packing effects byonly a lateral pressure exertion on the edge to bedrawn in an absolutely reliable sealing against the annular flange andcollar of the closure opening. Cons'equently, the previously 'requisitesimultaneous exertion of an axial pressure on the cap is dispensed with.The sealing thus acts all the more favorably since the lateral faces ofthe projecting edge of the closure are not subjected'to anypossibilities of being damaged. The thickness [of the packing may becomparatively small. owing to the possibility of exerting a stronglateral pressure. If necessary the entiresealing cap may be lined with acompressible packing material and a suitably preliminarily pressed capof packing material maybe inserted in the sealing cap. There resultstherefrom the possibility of providing a packing along the entire outerpart of the closure edge, including the upper part of the annular flangeof the container closure, since the locking tool is provided with meanswhich, when drawing in the edge of the cap, presses the cap coveragainst the annular flange and prevents an escape of the cap upwards.This fact complies with the desire to use the sealing cap as sealingmeans and as the sole packing means. The omission of the usual sealingmeans as for instance bung plugs with packing results in a great savingin the cost price of the closure.

The lateral arrangement of the packing allows of the notch lines beingextended over the edge of the sealing cap without the sealing beingthereby affected. The removal of the cap at the opening of the closureis thereby greatly facilitated because the remaining portion of the edgecan be pulled through without any difliculty. It is thus also possibleto make the cap of thicker material.

A further essential advantage is obtained with the invention bysimplifying the sealing of the closure. For instance, in bung closures,the pack-- ing, which is' provided externally and laterallyaround thecollar of the outwardly extending flange of the container is soproportioned that it" also surrounds the edge of the annular flange ofthe event of using an ordinary packing ring or z gasket of flat rubberwhich is smaller in diameter than the outwardly extending annularflange, the packing ring will automatically fit tightly around theannular flange inwardly when the packing ring is stretched around thecollar of the container flange. The bung plug may be directly screwed inand the sealing cap mounted thereon. A further substantial saving in thecost price results from the omission of the special bung plug packing.

With reference to the accompanying drawings, some constructional formsof the invention are shown therein.

Figure I shows a bung closure, wherein a bung bush b, externallysurrounded by the body of the container, is provided with an annularflange which projects outwardly in the upper part. The closure iseffected by the packing d and by the bung 0 adapted to be screwed in thebung bush. The cap packing e is placed around the receding neck of theopening edge b. The sealing cap I is loosely slipped over the sealingmeans and not yet flanged.

Figure II shows the same bung closure as Figure I, the edge of thesealing cap f being drawn in through the jaws g of the locking tool andtightly pressed against the packing e. When tightening the edge of thecap, a holding memher h of the locking tool bears on the sealing cap Iand prevents the same from sliding upward. The cap bears on the bungplug 0 whereby the sealing of the sealing cap 1 against the outwardlyinclined and upwardly rising flange edge becomes effective. The loweredge of the sealing cap is pressed tightly against the collar of theopening edge so that unauthorized manipulations by means of a tool areprevented. The arrangement of the packing, e on the flange of thecontainer allows of the packing being used several times.

Figures III and IV show the same closure as Figures I and II. Thepacking e is provided in the collar edge of the sealing cap f. FigureIII shows the sealing cap before the tightening of the edge while FigureIV shows the ready mounted and sealed cap I.

In the constructional form according to Figure V, the sealing cap I iscompletely lined with a packing material or a complete packing cap 1.The packing is effected on the entire outer part of the opening edgeincluding the upper part of the annular flange N. This efiective sealingby means of the sealing cap eventually dispenses with the insertion of ahung plug or the like.

Figure V also shows another form of the bung bush securing means. Thepacking of the sealing cap 1 against the body a of the container is onlyrendered possible in such a bung closure by the arrangement of the cappacking e, i according to the invention.

The constructional form according to Figure VI differs from that ofFigure V in that the opening edge is formed with the annular flange b ofthe material a of the container. This is a simplifled form of theclosure wherein the sealing cap serves simultaneously as sealing meansand locking means. V

Figure VII is a plan view of the closure with extends over the annularflange b so that it is 10 used simultaneously as cap packing and bungplug packing. Figure VIII shows how the cylindrical packing ring e offlat rubber, which is smaller in diameter than the annular flange bbears tightly around the annular flange b 15 inwardly when the packingring is stretched around the collar b of the bung. Figure IX shows theclosure according to Figure VIII with screwed in bung c and readymounted sealing cap I. It is shown in Figures X and In as compared withthe illustration in Figures VIII and IX how a flat or conical packingring disk e adapted to the bung packing surface can be used instead of acylindrical packing ring ea. It is obvious from Figure X how theoutwardly ex- 25 tending annular disk e is pressed downward by thesealing cap I and placed around the annular flange 12 Figure XI showsthe completely sealed closure with the mounted sealing cap 1 and packinge pressed thereon.

It is obvious that instead oi. the rubber packings e and e indicated byway of example, packings consisting of other compressible material mayalso be used. The packings may also be preliminarily pressed in a formadapted to the annular form.

.I claim:

1. In a structure of the class described, a container having a wall andan opening therein, a

flange surrounding said opening having a sub- 40 stantially annularexternal surface and an outer edge, a sealing cap applied over saidflange and having a skirt portion surrounding the'latter, a closure plugfltted in said opening, and a compressible packing member interposedbetween the I skirt of said cap and the external surface or said flangeand extending inwardly around the edge of the latter and beinginterposed between said edge and said plug thereby forming a sealbetween said plug and said flange and between said I0 flange and saidskirt.

2. In a structure of the class described, a container having a wall andan opening therein, a flange surrounding said opening and constituted bysaid wall, said flange having a substantially ll annular externalsurface and an outer edge, a sealing cap applied over said flange andhaving a skirt portion surrounding the latter, a closure plug fitted insaid opening, and a compressible packing member interposed between theskirt of 00 said cap and the external surface of said flange andextending inwardly around the edge of the latter and being interposedbetween said edge and said plug thereby forming a seal between said plugand said flange and between said 68 flange and said skirt.

ALFONS MAUSER.

